Dexter is hunting for Lyle Sussman, whom he believes is the Brain Surgeon killer.

Sussman's mother tells Miami Metro that Sussman is an avid hunter, and has a cabin outside of Miami.

After breaking into Sussman's house, Dexter finds a photo of this cabin, with a sign reading Lake Nona.

So Dex goes
to the cabin. But once there, he finds Sussman already dead,
hanging from a hook on the back porch of his cabin.

Later, it turns out that someone forced Sussman, at gunpoint, to suffocate the last victim - then disposed of Sussman.

We see the
cabin again at the start of Episode 9 ("What's Eating Dexter Morgan?"),
where the Miami Metro police are on the scene.

By then,
someone has come in and tampered with the crime scene, using a shotgun
to blow off the back of Sussman's head, making it look like he
committed suicide, and erasing evidence that he had been hanging from a
hook.

The cops conclude that Sussman was the Brain Surgeon killer, and that the case is now closed.

Dr. Vogel
shows up, and Dexter tells her that Deb is having problems because she
found out his secret. Vogel is surprised to see that Dexter
actually feels bad about Deb's suffering.

Q. What is it actually in real life?

A. A permanent cabin set at a movie studio (but not at Dexter's Sunset-Gower studio).

Q. Where can I find it in real life?

A. This cabin is part of a well-known set on the back lot of Warner Bros. studio, at 3400 Riverside Drive, in Burbank, CA.

It's part of an area at Warners Bros known as "The Jungle", which you can see if you take the Warner Bros. VIP tour.

The Jungle features this cabin,
which sits on the edge of a large lagoon, as well as a "house and barn
set" nearby, which is used as Merlotte's in the series True Blood.

( Dexter hasn't gone out to other studios very often. The last time they needed a cabin, for instance, was for the Doakes scene, and they built that on location in Palos Verdes. )

A. In the early seasons, I
usually had to hunt down the locations after viewing the episodes, using
clues from the various scenes. By the now, though, I've developed
a small group of fans, spies & tipsters who kept an
eye out for Dexter filming in their neighborhoods, and let me know in advance when something is about to film there.

Between those reports, my own personal reconnaissance around town, and a
few new resources I discovered, by the time the new first episode airs, I
already know most (but not all) of the filming locations, and only
need to watch the episodes and match up the scenes with the correct
locations.

I'm familiar with the Warner Bros. jungle set, both from taking the studio tour and from writing about it for the True Blood location of Merlotte's. So when Rick told me they were filming on the Warners lot, that was really all I needed...